You have to option to hide the websites from reports or not track the website entirely.
Show Excluded URLs/Applications in Reports:
By enabling this checkbox, all URLs and applications defined under the exclusion list will be listed in the reports.
Upload Excluded URLs/Applications from client
When
this option is disabled, URLs and applications under the Excluded List
will not be uploaded from the client database to the central database.
This option will permanently erase the excluded URLs and applications on
the client’s local database before any data is uploaded to the server.
Delete Excluded URL/Application History
When you click on this button, BrowseReporter will delete all the excluded URLs and applications from the CurrentWare database.